You can find some extended problems relating to the material in chapter 5 in the extended problems document. Question 1 is structured in a similar way to Problem 5.1 in Chapter 5 but Parts (a) to (e) are a little more involved by bringing in correction of signal using an internal standard. Part (f) is covered in Chapter 9 but some further explanation is given in the document.The short problems document also contains questions relating to material covered in chapter 9.